Features
c
Calling Party Control (CPC) Signal Detection
Description
The Calling Party Control (CPC) Signal is an on-hook indication
(disconnect signal) sent from the CO line when the telephone is
hung up at the other end. To support efficient utilization of CO
lines, the system monitors their state and when CPC Signal is
detected from a line, the system disconnects the line and informs
I
the extension with reorder tone.
Conditions
CPC Signal Detection is enabled or disabled on incoming and outgoing
CO calls by System Programming.
Generally CPC Signal Detection works on incoming CO calls, and
does not work on outgoing CO calls (except once they are placed on
Call Hold, Exclusive Call Hold or Consultation Hold). In this case, if
the extension user remains off-hook after the completion of an
outgoing CO call, the system does not release all the switches used to
establish the connection, and a CO line connected will continue to be
seized. To prevent this, it is administrable to make CPC Signal
Detection work on outgoing CO calls.
(Note: Some Central Offices
may send CPC-like signals during the dialing sequence and an attempt
to make a call may be terminated. If your CO does not send such
signals, it is recommended to make CPC Signal Detection work on
outgoing CO calls.)
If your Central Office does not send CPC-like signals, it is also
effective to limit the dialed numbers during a call by the program [991]
“COS Additional Information” on a Class of Service basis to prevent
unauthorized calls.
If CPC Signal is detected during a Conference call. the line is
disconnected and the remaining two parties maintain the call.
If CPC Signal is detected during a call between a DISA* caller and an
extension or an outside party, the line is disconnected.
Programming References
Section 4, System Programming,
[405]
CPC Signal Detection Incoming Set
[4 151 CPC Signal Detection Outgoing Set
[99 l] COS Additional Information, Field ( 1)
Feature References
None
Operation References
Not applicable.
*: Available for KX-TD 1232 only.
Features
3-37
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